where \(\sigma _{n_0}\)  and \(\sigma _{p_0}\)  are the cross sections leading to the ground states of \(^7\) Be and \(^7\) Li, respectively; and \(\sigma _{n_1}\)  and
\(\sigma _{p_1}\)  are those leading to the corresponding first excited states. Here, \(P_\ell \)  is the penetrability factor defined by [1]}, [2]}:
\(P_\ell (E,R)=\frac{kR}{F^2_\ell (E,R)+G^2_\ell (E,R)},\) 
